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
Followup 503f9b6f02ac5c4918d41611848c886b8755e5a0 This previous commit introduced an autogenerated settings route for every plugin with more than one setting defined. Plugins with only one setting only have enabled_site_settings defined, which are handled using the toggle in the admin plugin list, so we don't need a dedicated setting page for them. However in production this introduced a performance issue, since we were looking through SiteSetting.all_settings for every plugin, which could be quite slow in some cases especially on our hosting. Instead, we already have all the plugin settings cached inside `SiteSetting.plugins`. We can instead use this to count how many settings the plugin has, then if there is > 1 for a plugin we use the settings route. This is a much faster lookup than searching through SiteSetting.all_settings.